Among ocular infection isolates, invasive
and cytotoxic strains were significantly (P 0.02) associated
with older and younger dogs, respectively. Visible adverse
effects on epithelial cells were significantly (P 0.03) more
frequent for keratitis strains (6/12) than other strains (1/13),
but only three of these keratitis strains and the single nonkeratitis
strain possessed ExoU